Driving and morning impairment
NHTSA and FDA both frame impaired driving as a risk with sedating substances. Prescription status does not exempt someone from that risk. Build in a conservative window before driving after a new dose or dose change.
What makes grogginess worse
Late dosing, alcohol, short sleep, other sedating medicines, and untreated sleep apnoea stack with residual sedation. A pharmacist can identify hidden sedatives in OTC products.
Reporting without quitting alone
Morning grogginess that affects safety is a valid reason to call the prescriber. It is not a valid reason to stop abruptly without advice if the underlying symptom still needs treatment.
Sleep apnoea overlap
Untreated obstructive sleep apnoea causes daytime sleepiness independent of medicines. Sedation on top can be dangerous. Snoring, witnessed apnoeas, or morning headaches are worth raising with a clinician.